Driving dog for grinders and the like



July 31, 19.45. c BAKER 2,380,381

DRIVING DOG FOR GRINDERS AND THE-LIKE Fi led June 9, 1944 4am INVENTOR..

Patented J y I cum A. Baker,

Detroit, Mich, assignor of onehalf to Peter m Detroit, Mich.

Application June 9, i944, Serial No. new 2 Claims. (c1. az-so) The purpose of my improvement is to provide a practical driving dog of simple construction by means of which an object to be operatedupon in a grinding machine, a lathe or some other machine, may be imparted a rotary motion.

Another purpose of my improvement is to provide a dog having resilient means adapted to engage the object which is to be rotated,.so that said resilient means may be quickly broughtinto engagement with the object in question or disengaged therefrom. Another object is'to provide a dog in which the element adapted to be brought into engagement with the object to be rotated, may be replaced by another one, a stronger one, or having a longer reach, or both, as the case may be. I

I shall now describe my invention with reference to the accompanying drawing in which,

Fig. 1 is a side elevation of pertinent parts of a grinder, equipped with my dog, as applied to an object to be worked upon;

Fig. 2 is a plan view of. my driving dog;

Fig. 3 is a plan view of a member which is a part of my driving dog;

Fig. is a perspective view of members forming a part of my driving dog. g

The illustration shown in Fig. l, discloses the head stock of a grinder or a lathe, with" face plate ll, oppos'ed by tail stock Ii. Numeral l2 indicates center points, one, a live one in the head stock and another one, which is stationary, in the tail stock. The object II, which is to be operated upon, is heldin the customary manner between said center points. My driving dog,

generally indicated by numeral i4, is afnxed to face plate It, and extends beyond the end of the center point in head stock where it is in position to engage the end of objectv II.

The dog comprises anelongated member II, of uniform width and thickness. One end of it, It, turned at right angle to themain body thereof, has a circular hole therein to receive a screw It, by means of which the member may be affixed to plate II. By means 'of'steps l9 and 20, it is brought closer'to the axis, of the.

face 'plate so that its end, 2 I, lies approximately parallel to center point I2. Said end contains two axially aligned apertures "22, spaced from each other by an intervening bridge 25. A spring leaf 2!, having a pointed tip 24, is mounted on said member I! in such a manner that the middle portion is disposed over the bridge'and that the ends of said spring pass through apertures 22 to the opposite side of member i5, bearing against the outer rims of said apertures, respectively. In order that the spring may be held against slippage or displacement, it is held in place by a yoke 2!. "This is made. in the form of a band. extending transversely over spring 22 where it straddles bridge 2! of member l5. A'screw 21, centrally located within the wall of yoke 2', bears against the mid-section of spring 23*holding it in a frictional contact with the surface ofthe underlying bridge 25.

When my driving dog is in its operative position, tip 24 of spring 211s adapted toenter a suitable recess, hole, slot, or the like in object II. This is shown in'l 'ig. 1 where tip 24 is shown extending into a transverse bore 22 in object ll. When it is desired to remove the spring and to substitute for it another, a stronger one or having a. longer reach, this may be done easily and quickly by first removing the yoke which holds the spring in place. Once the dog 7 is in place, objects to be worked upon may be set in place between the center points, and brought into engagement with the tip of spring 23 without'the need of any adjustments. The

machine. 7

It will be seen that some changes may be made in the construction of my dog without departing from the inventive principle. disclosed therein. What I, therefore, wishto claim is as follows:

1. A driving dog for the grinders, of the kind described, comprising, an elongated strip of uniform width one end of which is attached to the face plate of the grinder, and having at the other end adjacent the axis of the face plate, two spaced, axially aligned apertures, a leaf spring anchored therein and provided with a point to engage 'a recess in an object operated upon in the grinder, and a removable band to hold the spring in place against slippage. 2. A driving dog for grinders comprising a elongated strip of uniform width and thickness, ajmxed at one end to the face plate of the grinder and having at the other end two spaced, axially aligned apertures, a leaf spring passing from one aperture over the intervening portion of the strip into the other aperture towards the CALVIN A. BAKER. 

